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R. G. LITTLE.

PLUG.

APPLICATION FILED SEPT. 14. 1918.

Patented Nov. 18, 1919.

LSQQAQSQ amen W01 'tremely simple and inexpensive 1 6 is enlarged to RENNIE G. LITTLE, 0F MANCHESTER, NEW H til PLUG.

aeaa aae Specification of Letters Patent.

Patented Nov. as, tea a.

Application filed September 14, 1918. Serial No. 254,159.

This invention relates to internal combustion engines, particularly to igniting devices therefor, and has for its ob]ect the provision of a plug within which an ordinary spark plug 1s threaded and which is provided with a chamber communicating w1th the firing chamber of the engine cylinder through a pair of ports and also through a valve controlled opening,

An important object is the provision of a device of this character which is so constructed that during the operation of the engine a small portion; of the explosive charge will be drawn into the chamber of the plug where it will be ignited and subsequently discharged into the firing chamber of the'engine cylinder so as to insure the ignition of a charge therein.

provision of a dewhich will be exin manufacture, highly eflicient in use, duralble in service and a general improvement in the art.

With the above and other objects and advantages in view, the invention consists in the details of construction to be hereinafter more fully described and claimed, and illustrated in the accompanying drawing, in which Figure 1 is a sectional view through a portion of an internal combustion engine showing my plug applied thereto and having a spark plug associated therewith Fig. 2 is a side elevation of the device detached and,

- Fig. 3 is a detail cross sectional view therethrough.

Referring more particularly to the drawing the letter A designates a portion of an intei'nal combustion engine 0 linder provided with theusual threade opening B for engagement of a spark plug.

My device is indicated as a whole by the numeral 5 'nd comprises a cylindrical body 6 external y threaded as shown at 7 for engagementw-ithin the opening B in the engine cylinder. At its upper end the body provide an angular portion Another object is the vice of this character 8 engageable by a wrench for screwing the device into the engine cylinder. The unc-' ture of the enlarged angular portion 8 with the threaded' portion 7 of the body defines a shoulder 9 engageable upon the top of the cylinder casting. The bottom wall of the body '6 is provided With a central opening 10 forming a valve seat. The body 6 is provided with a bore 11 communicating with the opening 10 and also communicating with a bore 12 of greater diameter formed in the angular portion 8. The bore 12 is internally threaded and is of the same diameter as the externally threaded portion 7 of the body.

A ball 13 is disposed within the lower end of the bore 11 and normally closes the central opening 10 in the bottom wall of the plug. The ball 13 is movable. and has its upward movement limited by a cross bar 14: extending across the intermediate portion of the bore 11. At opposite points, the lower portion of the body 6 is provided with ports 15 communicating with the bore ll.

In use, the device is threaded into the ordinary spark lug opening B and a spark plug G is threa ed into the bore 12 whereupon its firing points will extend into the bore 11. On the compression stroke of the engine piston the pressure of the change upon the W111 allow a portion of the compressed charge to enter the bore 11 through the central opening 10 in the bottom of the plug. When the plug C fires the charge within the bore 11 will be ignited and will flash through the ports 15, igniting the charge in the combustion chamber of the engine cylinder. I

From the foregoing description .and a study of the drawing it will be apparent that I have thus provided what is in effect an auxiliary firing chamber within which a small ortion of the charge will beinitially ignite for producin and discharging into the combustion cham er of the engine along hot flash which will be. very effective in igniting the main charge. will be noted that in view of the fact that only a small portion of the charge comes in contact with the firing points of the spark plug that fouling of the points of the plug will be reduced to the minimum and the efficiency of the plug will be consequently increased. I

While I have shown and described the Furthermore, it 1 ball 13 will unseat the ball and preferred embodiment of the invention, it will of course be readily understood that I reserve the right to make such changes in -the form, construction and arrangement of parts as will not depart from the s irit of the invention nor the scope of the su' joined claims.

Having thus described my invention I of an engine, said body being a apted for the receptlon and connection of a spark plug, the lower end of said body forming a gas chamber and being provided With opposite laterally extending ports communicating with the bore thereof and with the combustion chamber of the engine, and a ball movably disposed in an aperture in the lower end of said body and extending above the lower edges of said ports whereby to deflect through said ports burning gas ignirted within said bore.

threaded for engagement within 2. A device of the character described comprising a cylindrical body externally the spark plug openin' of an engine, the lower portion of said body being provided with a bore and its bottom wall being provided with a vertical openin said bore and with t e combustion chamber of the engine, the lower portion of said body being provided with lateral ports oommunicating with the combustion chamber and with said bore, a ball disposed within said bore and normally closing said opening, said ball extending above the lower edges of said ports to serve as a deflector, means for limiting the upward movement of said ball, the upper portion of said body being provided with a bore internally threaded for the rece tion of a spark plug, and said last, named ore being of the same diameter gzdthe externally threaded portion of said y. y In testimony whereof I aflix my signature.

RENN IE G. LITTLE.

communicating with 

